1968 (20th)
- The Big Valley: "The Martyr" — Mel Goldberg
- Gunsmoke: "Fandango" — Don Ingalls
- Mission: Impossible: "Odds on Evil" — William Read Woodfield & Allan Balter
- Star Trek:
- "The City on the Edge of Forever" — Harlan Ellison
- "The Return of the Archons" — Teleplay by Boris Sobelman; Story by Gene Roddenberry
Read more about this topic: Writers Guild Of America Award For Best Screenplay – Episodic Drama